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STEAM BOILER FURNACE. v No; 523,824. Patented July 31, 1894.

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HERMANN WILMS, OF COLOGNE, GERMANY.

STEAlVl-BOlLER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 523,824, dated July 31,1894.

Application filed November 24, 1893 Serial No. 491,874- '(No model.) i

To 04% whom it may concern.-

Be it known that I, HERMANN WILMS, merchant and manufacturer, of 11Salier Ring, Oologne-on-the-Rhine, in the Empire of Ger many, haveinvented new and useful Improvements 1n and Relating to Steam-Boiler andother Furnaces, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention relates to a furnace, more particularly designed for steamboilers, which has for Us ob ect to economically utilize pul verulent,granular and inferior fuel and waste,

and, by continually introducing air under pressure, to produce as far aspracticable a smokeless combustion. In this furnace it is not necessaryto use expensive arrangements for lntroducing the air under pressure,the chamber which receives thisair being formed dlrectly by the masonryor the walls of the b o1ler and a closing plate. The. grate conslsts ofsingle exchangeable fire bars which,

' being placed side by side, constitute a very suitable grate surfacefor pulverulent or granular fuel. Through the free portion of thegratewhich consists of fine openings tapering upward between the several firebars, the air under pressure is conducted to the fuel for the purpose ofpreventing the grate surface being clogged up or the fire bars bakedtogether.

In the accompanying drawings illustrating how my invention may beconveniently carrred 1nt0 practice, Figure 1 represents a side View of afire bar. Fig. 1 is a plan showing a set of fire bars. Fig. 1 is avertical transverse section on the line A-B of Fig. 1. Fig. 2 1s atransverse section showing the appl cation of my invention to aheating-tube boiler with external firing. Fig. 3 is a verticallongitudinal section representing how my invention may be applied to aflue tube boiler.

with internal firing. Fig. 4: on the left hand side represents a sectionon the line 0 D of F g. 3, and on the right hand side a front vlew ofthe constructional form shown in Fig. 3.

The grate, Figs. 1, 1*, and 1 is. composed of single fire bars havingupwardly tapering recesses a which when the fire bars are placed s de byside form fine openings. Noses 0 pro- Vided on one side of each fire barengage with fire bar and thus prevent the longitudinal displacement ofthe fire bars. These fire bars are like an ordinary plane grate,supported by the masonry in the case of externally fired boilers, asshown in Fig. 2, and by the flue tube in the case of internally firedboilers, as illustrated in Figs. 3 and 4. In front below the grate Iprovide, as shown in Fig.2, a closing plate e forming a tight joint withthe front plate of the furnace and also with the two sides of themasonry, which is obtained by simply filling in mortar between the edgesdepressions d on the other side of the next of the said plate and themasonry. In the internally fired boiler represented in Fig. 3 theclosing plate is formed directly by the lower front part c of the fluetube. The fire-bridge g joins the grate in the known manner and thegrate h in conjunction with the said fire bridge and the closing plate 6or e divides the combustion chamber into two compart- Y manneratmospheric air is drawn into the latter compartment, as indicated byarrows in Fig. 3, and is forced through the openings at in the grate. Bythe current of air the finely divided fuel is kept floating at somedistance from the grate in the known manner and undergoes an energeticsmokeless combustion.

It will be readily seen that in this arrangement repairs will but rarelybe necessary either for internal firing or for external firing. Whenthisnecessity arises it may easily and cheaply be eifected' by reason ofthe exchangeableness of the fire bars, while the whole furnace canbe'constructed at a very small cost. In like manner the operation ofthis furnace is very simple and economical.

' When the fire is first lighted in the furnace a better fuel such ascoke is put on the grate and the fire stirred and kept up by blowing inair as above described until it possesses the necessary energy. Thenpulverulent, granular fuel or waste is introduced and the admission ofair is regulated so that the fuel floating above the surface of thegrate is kept in continual motion and undergoes an energetic combustion.

In the front plate f is arranged an ash hole Z with a door, throughwhich the ashes may from time to time be removed from the compartment E.a

The grate bars provided with rows of small apertures, tapering frombottomto top, have an important function in connection with forcing airunder pressure into the air chamber beneath the grate. By thisconstruction the air passes up through each of these tapering apertures,and is delivered with considerable force, as from a tapering nozzle,above the grate. This tends to keep the pulverulent material upon thegrate in a state of suspension and enables it to be readily consumed.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-- A steam boiler for pulverulent material having 'a grateprovided with a series of rows of cone shaped apertures increasing indiameter from top to bottom, forming upwardly

